Invidia Catted Downpipe 2008-2014 WRX / 2008-2018 STI / 2005-2009 LGT

This very nice downpipe from Invidia features a CAST divorced-wastegate collector. It features a divider to separate the wastegate passage from the main exhaust passage to reduce turbulence at the turbo.

In addition, this downpipe comes with a high-flow catalytic converter so you can be nice to the environment, and pass visual and tailpipe emissions tests. (Or, if you're just planning to drive your car at the track, there's a cat-free version.)

You also have the option of a built-in extra wideband oxygen sensor bung, so you don't have to have one welded on to your brand-new downpipe. Save money and time!

Regardless of your choices, you'll be getting one of the nicest downpipes made, with beautiful machining on the front and back flanges, fully polished 3" stainless steel pipe, and smooth mandrel bends.

NOTE: Whenever you modify your factory catalytic converter, you may end up with a "catalytic converter efficiency" check engine light (CEL) code. Although you are less likely to have this code if you do have some kind of cat in the system, you may still get the code, even with a high-flow cat.

All these bolt up to most any cat-back that's designed to bolt up to a flat flange. They are NOT ideal for the stock cat-back, but could be made to fit with an adapter like this one.